Del'tsova,D.P.; Gambaryan,N.P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1971 , vol. 20, p. 1382 - 1386
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1971 , vol. 20, # 7 p. 1481 - 1486